v3.26.1
Loans and Allowance for Credit Losses - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance $ 12,873   $ 8,486
With no related allowance recorded, Recorded Investment 11,935   6,284
With related allowance recorded, Unpaid Principal Balance 49,858   39,540
With related allowance recorded, Recorded Investment 40,505   33,992
With an allowance recorded, Allowance for Credit Losses Allocated 7,637   5,365
Unpaid Principal Balance 62,731   48,026
Recorded Investment 52,440   40,276
With no related allowance recorded, Average Recorded Investment 9,110 $ 5,027  
With no related allowance recorded, Interest Income Recognized 96 32  
With an allowance recorded, Average Recorded Investment 37,248 22,099  
With an allowance recorded, Interest Income Recognized 4 5  
Average Recorded Investment 46,358 27,126  
Interest Income Recognized 100 37  
Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 4,467   3,795
With no related allowance recorded, Recorded Investment 4,346   3,734
With related allowance recorded, Unpaid Principal Balance 12,959   7,461
With related allowance recorded, Recorded Investment 11,634   6,758
With an allowance recorded, Allowance for Credit Losses Allocated 2,054   1,639
With no related allowance recorded, Average Recorded Investment 4,040 3,052  
With an allowance recorded, Average Recorded Investment 9,196 4,813  
With an allowance recorded, Interest Income Recognized   0  
Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 2,518   2,146
With no related allowance recorded, Recorded Investment 2,410   707
With related allowance recorded, Unpaid Principal Balance 29,896   24,794
With related allowance recorded, Recorded Investment 22,736   20,820
With an allowance recorded, Allowance for Credit Losses Allocated 4,120   2,303
With no related allowance recorded, Average Recorded Investment 1,559    
With no related allowance recorded, Interest Income Recognized 95    
With an allowance recorded, Average Recorded Investment 21,778 8,014  
With an allowance recorded, Interest Income Recognized 4 4  
Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 47   610
With no related allowance recorded, Recorded Investment     552
With related allowance recorded, Unpaid Principal Balance 3,708   3,975
With related allowance recorded, Recorded Investment 3,467   3,704
With an allowance recorded, Allowance for Credit Losses Allocated 832   875
With no related allowance recorded, Average Recorded Investment 276    
With no related allowance recorded, Interest Income Recognized 1    
With an allowance recorded, Average Recorded Investment 3,585 4,915  
With an allowance recorded, Interest Income Recognized   0  
Agricultural Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 2,387   297
With no related allowance recorded, Recorded Investment 2,090    
With related allowance recorded, Unpaid Principal Balance 2,235   1,694
With related allowance recorded, Recorded Investment 1,663   1,167
With an allowance recorded, Allowance for Credit Losses Allocated 389   262
With no related allowance recorded, Average Recorded Investment 1,045 1,975  
With no related allowance recorded, Interest Income Recognized   32  
With an allowance recorded, Average Recorded Investment 1,415 2,351  
With an allowance recorded, Interest Income Recognized   0  
Agricultural [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 3,434   1,624
With no related allowance recorded, Recorded Investment 3,089   1,291
With related allowance recorded, Unpaid Principal Balance 281   897
With related allowance recorded, Recorded Investment 268   862
With an allowance recorded, Allowance for Credit Losses Allocated 62   124
With no related allowance recorded, Average Recorded Investment 2,190    
With an allowance recorded, Average Recorded Investment 565 1,231  
With an allowance recorded, Interest Income Recognized   0  
Consumer [Member]      
Financing Receivable Impaired [Line Items]      
With no related allowance recorded, Unpaid Principal Balance 20   14
With related allowance recorded, Unpaid Principal Balance 779   719
With related allowance recorded, Recorded Investment 737   681
With an allowance recorded, Allowance for Credit Losses Allocated 180   $ 162
With an allowance recorded, Average Recorded Investment 709 775  
With an allowance recorded, Interest Income Recognized $ 0 $ 1